Do you live in a warm country - then you might want cool colours: pale blues, greys or greens. I would leave your bathroom as it is - love the niches. To add some cosiness to the marble floors, find a nice cream carpet and cream furniture and then use this as your base for colours that you like. BTW what colours do you like? What inspires you. When you travel or go out ... what is that makes you happy? This will help

A picture is worth 1,000 words of advice at Houzz. Please comment here and use the Attach Images button to add pix of the space where you have the dilemma. Do you have an inspiration picture, piece of art, rug or fabric that is determining the color for each bedroom or are you just grabbing these colors out of a hat? White goes with all of them.

For each bathroom choose a neutral color that U see in the tile Here is how to find the perfect wall paint "match" http://www.lindaholtinteriors.com/2011/07/testing-wall-color-101/

San Marco paints has got good range of interior and exterior paints with amazing finishes, try connecting San Marco India office in Mumbai and Delhi